Open Access Repository

Effects of shellfish farming on the benthic environment


Downloads per month over past year

Crawford, CM, MacLeod, CK and Mitchell, IM 2003 , 'Effects of shellfish farming on the benthic environment' , Aquaculture, vol. 224, no. 1-4 , pp. 117-140 , doi: 10.1016/S0044-8486(03)00210-2.

Crawford_et_al_...pdf | Download (513kB)
Available under University of Tasmania Standard License.

| Preview


The benthic environment under and near three shellfish farms in Tasmania, Australia, which had had a relatively high level of production over many years was investigated. Benthic samples were collected along transects which ran across the farms, generally from 100 m upstream to 100 m downstream. Sediment deposition, redox values, sediment sulphide concentrations, organic carbon content and water turbidity levels near the bottom were significantly different between the farms but not between sites outside the farm, at the boundary and sites within the farm. Video recordings at one farm showed dense coverage of fine filamentous algae and patchy bacterial mats directly under some longlines and this algae is thought to have fallen off the mussel longlines. At another farm dense beds of seagrass were observed in the videos both under trays of oysters and outside the farm. The benthic infauna did not show clear signs of organic enrichment, and neither univariate nor multivariate measures of benthic infauna were significantly different between sites inside and outside the farm, although they were different between farms.

It was concluded from these results that shellfish farming is having little impact, and much less than salmon farming, on the benthic environment in Tasmania. Thus extensive monitoring of shellfish farms would appear to be not necessary.

Item Type: Article
Authors/Creators:Crawford, CM and MacLeod, CK and Mitchell, IM
Keywords: Shellfish farming; Environmental impact; Benthic environment
Journal or Publication Title: Aquaculture
ISSN: 0044-8486
DOI / ID Number: 10.1016/S0044-8486(03)00210-2
Additional Information:

The definitive version is available at

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page